243331421953 has 2 divisors, whose sum is σ = 243331421954. Its totient is φ = 243331421952.

The previous prime is 243331421909. The next prime is 243331422043. The reversal of 243331421953 is 359124133342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238830622209 + 4500799744 = 488703^2 + 67088^2 .

It is a cyclic number.

It is not a de Polignac number, because 243331421953 - 2³³ = 234741487361 is a prime.

It is not a weakly prime, because it can be changed into another prime (243331424953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121665710976 + 121665710977.

It is an arithmetic number, because the mean of its divisors is an integer number (121665710977).

Almost surely, 2^243331421953 is an apocalyptic number.

It is an amenable number.

243331421953 is a deficient number, since it is larger than the sum of its proper divisors (1).

243331421953 is an equidigital number, since it uses as much as digits as its factorization.

243331421953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The spelling of 243331421953 in words is "two hundred forty-three billion, three hundred thirty-one million, four hundred twenty-one thousand, nine hundred fifty-three".